Screw pump



March 6, 1928. 1,661,247

' F. F. AMBROSE SCREW PUMP Filed April 19, 1926 INVENTOR; Fran/ r Fflmfirase; BY //0 I 1 AM I ATTORNEY'-.

FRANK r. AMBROSE, or Los memes, c ments;

Patented Mar. 6, 1928. 8

SCREW PUMr.

, Application filed'April s, 1926'.- Serial-No. 102,869;

. Thisinvention relates-to ascrew um gbf the type illustrated in LettersPatent No. 529,837, issued on"November 27,- 189 1, to.

William E. Quimby, in which two. pairs ofintermeshing screws, right andleft and left and right, respectively, are mounted inthe same horizontalplane on parallel s'ha fts 'journaled in bearings in the heads of ashell bored to fit the perimeters of the unintermeshed portions of thescrews.

lutions and projecting hollow cores which, by holding the outer endsofthe "threads spaced apart from. the heads of the casing and theirinnerends spaced apart from each 1 other, provide two end chambers andone centrally located chamber, and the; necessary inlet and outletopenings to these chambers are formed through the lower and upper wallsof the casing.

In the drawings forming a part of this application, Fig. 1 is a sideelevation of my improved pump. Fig. 2 is an enlarged vertic'al crosssection on the line 22 of Fig. 1.

Referring to the drawings 5 is the base block which is secured to anysuitable foun-v dation, such as the floor of the pump house not shown.78 and'9 are pedestalswhich are mounted upon and secured to 5 1n anysuitable manner. Pedestals 7 and 8 are connected to the lowerpart orbody 10 of the gear case which extends to the horizontal plane of thecenter of shafts 11 and 12. A

15 and a cover member 16. Shafts lland 12 pass longitudinally throughthe pump chamber casing and have mounted thereon within said casing andin the pumping chamber intermeshing rightand left and left and righthand screws like the screws described in said Patent No. 529,837, ofwhich screws 17 and 18 are shown in Fig. 2. Member 15 is mounted uponbase 5 and the dividing line between 15 and 16- is in the planethatpasses through the horizontal central line. of shafts 11 and 12 and thetwo mem-V bers'are adjustably connected. At the ends of members15 and 16.are split bushings 19,

The.

screws have threadsoftwoor more convo-.

Inthe lower part of member 15 is the inlet chamber 20'which is providedat each end. with two ports, one on each side, so that either side ofthepu'mp may be connected to the supply. 11 channel 21 connects chamber 20'with the pumping chamber 22 which last chamber is formed by the cover 16and upperfp art, of body 15; The screws in :the pumping chamber havetheends reduced to 1,661,241 PI K 1 formhubs, of which hubs 1-75 and 18are shown in: Fig. .2. Theo ther' screws on shafts 11 and 12 have likehubs which abut against. hubs 17 and 18 thereby forming a centralchamber 23 which chamber has outlet'ports 23 in body'15, either; ofwhich may be con- V nected by apipeQt to place of use. Cover 16 "h ascentral: brace lugs 25 and 26 which are integral therewith ormay bedetachably connected thereto as desired. These lugs are faced withwearing plates 27 and 28 the lower faces of which rest upon the hubs ofthe screws in I the pumping chamber andthereby hold the threads of thescrews from contact ng with the cover when the pump 1s 1n operation..Shaft 11 projects from the gear case and 'is driven by any suitable 29.Shaft 12 projects from the pump chain her and is driven by alike motor30.

. By this construction if it is desired to pump 01]. or other liquid ofa heavier viscoslty than that for which the pump is'designed the covermembers of the pumping chamber can be shimmed up so as to pro power,illustrated in the drawings as motor .vide a pumping chamber of agreater capacity, thereby enabling the pumping of a "heavier liquidwithout waste of power. By'

providing inlet ports at both ends and in bothsldes of the inlet chambercasing, easier installation of the pump and greater pumping capacity isprovided than if the inlet andoutlet chambers had only' one port in eachand on one side only, but if desired the ports may be in one side only.By making the ports in the body member access may be had to-all theparts without rem0ving a power unit.

Having described my inventio11,Iclaim- 1. In a screw pumpa pump chambercasing divided horizontally and longitudinally onthe'center line of thescrews, said casing having formed in the upper portion a pumping chamberand in the lower portion an inlet chamber, said chambers having ports inthe lower member of the casing, there being a suction port at each endand a discharge port in the center of said lower casing member.

'2. In a screw pump a pump chamber cas ing divided horizontally andlongitudinally on the center line of the screws, said casing .havingformed in the upper portion a pumping chamber and in the lower portionan inlet chamber said pumping chamber having an outlet 1n each side 1nthe center and in the lower portion, said inlet chain: her having portson each side at the ends thereof. a

3. A screw pump of the type described said casing, two pairs ofinterineshing right and left screws with threads rigidly 1nounted onsaid shafts, said screws having hubs at their meeting ends to form ashort cen' trally located chamber open to the ends of the threads of thescrews; and brace lugs secured to'the cover ol' saidpumping chamberi andengaging the hubsotthescrewsiat I their meeting points.

4. A screw pump of thetype' described comprising acasing dividedhorizontally and longitudinally'on the centralline of the screws; saidcasing having ports in both. sides in the lower portion; and forming aninlet and a pumping, chamber two parallel shafts journaled insplithearings in the heads of said casing and passing through thepumping chamber means to cause said shafts to rotate in unison; means,to. rotate said shafts, said rotating means being applied separately toeach shaft;'two pa rs of interineshing right vand left screws -with"threads rigidly mounted on Said shafts, said screws having hubs at theirmeeting ends to form a short centrally located chamber open toth'e endsof the threads of the screws; and brace lugs'secured to, the cover ofsaid pumping chamber'and engaging the,

hubs of the screws at their meeting points."

In witness that I claim the foregoing I have hereunto subscribed by namethis 13th day'of April, 1926. a w

FRANK AMBROSE;-

